class Counter{
    public int count;
    // 此方法是下面方法的简化版本
    synchronized public void increase(){
        count++;
    }

    // this作为了锁对象
    public void increase2(){
        synchronized(this){
            count++;
        }
    }

    // 下面两个方法等价
    synchronized public static void increase3(){

    }

    public static void increase4(){
        synchronized (Counter.class){

        }
    }
}
public class Demo14 {
    public static void main(String[] args) throws InterruptedException {
        Counter counter = new Counter();

        Thread t1 = new Thread(()->{
           for(int i = 0;i < 50000;i++){
               counter.increase();
           }
        });

        Thread t2 = new Thread(()->{
            for(int i = 0;i < 50000;i++){
                counter.increase();
            }
        });

        t1.start();
        t2.start();

        t1.join();
        t2.join();
        System.out.println(counter.count);
    }
}
